Radial cylindrical roller bearings used as semi-locating and locating bearings can support axial forces in one or both directions in addition to radial forces.

The axial load carrying capacity is dependent on:

• the size of the sliding surfaces between the ribs and the end faces of the rolling elements
• the sliding velocity at the ribs
• the lubrication on the contact surfaces.

Ribs subjected to load must be supported across their entire height.

The permissible axial load F_{a per} must not be exceeded, in order to avoid an unacceptable increase in temperature.

The axial limiting load F_a max according to the formula must not be exceeded, in order to avoid impermissible pressure at the contact surfaces.

The ratio F_a/F_r should not exceed 0,4. In the case of bearings of TB design, the value 0,6 is permissible. Continuous axial loading without simultaneous radial loading is not permissible.

The axial load F_a per and the limiting load F_a max are calculated as follows:

In the case of cylindrical roller bearings with snap ring grooves, application engineering advice is necessary. The limit values and calculations for F_a per and F_a max are not therefore valid for these bearings.

For bearings under dynamic loading, the following applies:

If an axial force F_a is present in addition to the radial force F_r, the load ratio must be taken into consideration.

For bearings under static loading, the following applies:

In continuous operation, a minimum radial load of the order of F_{r min} = C_0r/60 is necessary.

If F_{r min} ＜ C_0r/60, please contact us.

Recommended shaft tolerances for radial bearings with cylindrical bore, see table. Recommended housing tolerances for radial bearings, see table.

Cable sheave bearings normally have circumferential load on the outer ring and a press fit is therefore required on the outer ring.

In order to prevent lateral creep of the bearing rings, they must be located by force or physical locking means.

The abutment shoulders (shaft and housing) should be sufficiently high and perpendicular to the bearing axis.

The transition from the bearing seating point to the abutment shoulder must be designed with rounding to DIN 5 418 or an undercut to DIN 509. The minimum chamfer dimensions r in the dimension tables must be observed.

In the case of semi-locating bearings, the bearing rings only require support on one side, on the rib supporting the axial load.

In axially loaded bearings, full support must be provided for the ribs transmitting forces, Figure 1.

The grooves allow the outer rings to be axially located using retaining rings, Figure 1. Suitable fasteners are WRE rings or rings to DIN 471. Locating rings are not included in the delivery. The design 2NR is supplied with two retaining rings WRE packed loose.

The split inner ring must be axially secured, Figure 1. The fasteners must not be subjected to axial load.

The sealing rings must be supported to a sufficient height, so that they are not pressed out during lubrication of the bearings, Figure 2. The dimension d₂ in the dimension table must be observed.

During fitting and dismantling of the bearings, the mounting forces must never be directed through the rolling elements, sealing rings or the fasteners on the split inner ring.